Bullet



Jan, 29, 1924 82344 R. A. BRIGGS BULLET Filed Nov. 2, 1922 Patented Jan. 29, 1924.

UNITED STATES ROY A. BRIGGS, OF MALONE, NEW YORK.

BULLET.

Application filed November 2, 1922. Serial No. 598,561.

To all whom it may concern:

Be it known that I, ROY A. BRIGGS, z citi- Zen of the United States, residing at Malone,

in the county of Franklin and State of New York, have invented a new and useful Bullet,

of which the following is a specification.

This invention relates to bullets designed primarily for use in low power firearms whereby practically the same result, except as to velocity. will be obtained by the use of a low power firearm as where a high power firearm is employed. A high power gun necessarily has a very small bore and, of necessity, cannot project bullets of any considerable weight. Consequently perforations produced by. the bullets are not sufficiently large to satisfactorily bleed game. It is therefore desirable to use low power firearms if possible but owing to slight variations in the bores of firearms of the same caliber and also to slight variations in the size of bullets of the same caliber the action of the gases on the bullets is rarely uniform. Thus accuracy in hitting a target cannot always be obtained because leakage of gas in varying quantities around the projectile causes variations in the velocity and trajectory of the projectile which cannot as a general rule be figured out in advance.

To secure accuracy it is absolutely neces sary that there be no variation 'of gaspr'essures but as it is practically impossible to make bullets for low power guns so as to be without variation in size, the desired accuracy cannot be obtained.

It is an object of the present invention to provide a bullet having means combined therewith whereby the sudden pressure to which the bullet is subjected by the ignition of the explosive will result in a slight expansion of the base of the bullet so that it will be caused to fit snugly in the bore and compensate for any variation which otherwise would result in the loss of pressure.

Another object is to provide a bullet of this character which can be manufactured readily and is inexpensive to produce.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that. within the scope of what is claimed, changes in the precise embodiment of the in vention shown can be made without departing from the spirit of the invention.

In the accompanying drawings the preferred forms of the invention have been shown.

In said drawings Figure 1 is'a section through one form of bullet embodying the present improvement, the core being'shown in elevation.

Figure 2 is a similar view of another form of bullet before the parts have been permanently connected.

Figure 3-is a view similar to Figure 2 and showing the jacket of the bullet contracted about the core to produce a finished bullet.

Figure 4 is an enlarged section on line 44, Figure 2.

Fig. 5 is aside elevation of a cartridge having the present invention combined therewith, a portion of the cartridge shell being broken away. I

Figure 6 is a section showing the bullet expanded in the bore of a firearm under the action of the bullet.

Referring to the figures by characters of reference 1 designates a solid metal core having a frusto-conical head 2 at one end thereof. This core is surrounded by the soft metal body 3 of the bullet, t his body being tapered toward the small end of the core while thebase of the body has a flared recess 4 therein in which head 2 is seated snugly. A thin sleeve 5 of copper or other suitable metal is fitted snugly about the core 1 and within the body 3.

The parts are normally held together by friction, each part fitting tightly within the next part therearound and thus the solid bullet that is formed can be handled like an ordinary bullet and can be included as an element of a cartridge.

When the charge of powder is ignited the gas pressure produced will set up a slight initial movement of the core relative to the body of the bullet with the result that the base portion of the body will be slightly expanded so as properly to engage the bore of the firearm and thus prevent leakage of pressure. Consequently the velocity of the bullet will not vary because of gas leakage and much greater accuracy can be obtained than should a loosely fitting bullet be expelled from the firearm.

In Figures 2 to 5 ii'iclusive another form gas pressure propelling the of bullet embodying the same principle has been illustrated. In this device the core 6 not only has a frusto-conical head 7 atits base but also has a tapered portion 8 extending from its other end. The core is cut away annularly back from this tapered end as shown at 9 thus to produce an annular shoulder 10. The soft metal body 11 of the bullet is fitted on the core and has a tapered recess 12 to receive the head'T. A thin metal sleeve 13 is fitted in the body and engages the core. In assembling the parts the body, with. the sleeve'therein, is slipped onto the tapered end of the core until seated against the head 7. The small end of the body is thus positioned close to the shoulder 10 as shown in Figure 2. Said end of the body is then pressed inwardly or pinched so as to lie back of the shoulderlO as shownin Figure 3. In this way the parts are'held properly assembled;

When this form of bullet is used the action is the same as that described in connection with the device shown in Figure 1. M As shown in Figure 5 the bullet is placed'in the bore 14 of a firearm and the pressure gen erated back of the bullet will set up'a'sli'ght forward movement of the core relative to th body 11. Thus the base portion of the body will be slightly expanded as shown at 15 so as to properly seal the'contact between the bullet and the bore.

By employing bullets such have been described slight inaccuracies in the proportions of the bullets will. not aflect t'he velocities of the bullets provided all otthe bullets are of the same weight; Therefore practically the same resultsca n be obtained by the use of these bullets in low power guns as can be secured by the employment of more expensive ammunition in high power guns. The head 7 of the core extends radially beyond the conical portion so as thus to form an abutment for pressing against the end of the body of the bullet after it has been expanded.

That is claimed is 1. A bullet comprising a core having a frusto-conical head at one end and a body extending around ,the cOre and expansible at thebase by the movement of the core relative to the body under the action ot gas pressure, the exp0sed face of the head of the core being flat and extended radially beyond the recess in the body.

2. A bullet comprising a core having a frusto-co'ni'calhead at one end, a sleeve upon the core, and a body extending around the sleeve and the core and engaging the head, the base portion of the body being expansible by the head when subjected to gas pressure, the exposed face 'ofthe head of the core being fiat an'd extended radially beyondthe head receiving opening in the body. i i

3. A bullet comprising a core, a head at one en'd thereof, there being'an annular groove inthe core near'its other end. a body extending around the coreand having one end pre'ssed'into the groove' to'hold the core and body assembled, said head constituting means for expandingthe' base orthe body when subjected to 'ga'spress'ureQ 4 4. A bullet comprising a "core, a trustoconicalhe ad at one end thereof, there b'e ing an annulgar groove in the corenear itsother endga body extending aroundthe 'corean d engaging the head," a sleeve int'erposed'betweenthecore and body," ne end of the sleeve and 'bodybeing compressed'jin'to the groove to hold the core a'n'd'b'ody assembled. i

In. testimony that 'Ifclaim the foregoing as my "own, I have hereto "affixed my signature in the presence of two witnesses.

ROY"A. BRIGGS. Witnesses:

" KARL H. VVALBRIDon, Gnonqn RADQRE. 

